DVD X-copy platinum playback

I hope some can help.
I just completed a build of a nex XP box and loaded the latest release of DVD X copy Platinum. I burnt my first backup, (magicspin 8X using TDK +R disk) without any problems. During playback on a Panasonic A7 player everything was flawless for the first 20-25 minutes then the disk "froze". Can't start in a chapter past this point. Any ideas?